a(n) = n! * (1 + Sum_{k=0..n} binomial(k+2,3) / k!).
A368763
a(n) = n! * (1 + Sum_{k=0..n} binomial(k+2,3) / k!).
Terms
- a(0) =1a(1) =2a(2) =8a(3) =34a(4) =156a(5) =815a(6) =4946a(7) =34706a(8) =277768a(9) =2500077a(10) =25000990a(11) =275011176a(12) =3300134476a(13) =42901748643a(14) =600624481562
External references
- oeis: A368763